package com.lenovo.newsapp.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import com.lenovo.newsapp.R;

public class CrashHandler implements UncaughtExceptionHandler {

	private final static String TAG = "APP_CRASH";

	private Thread.UncaughtExceptionHandler mDefaultHandler;
	private static CrashHandler crashHandler = new CrashHandler();
	private DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss",
			Locale.CHINA);
	private Context context;
	private Map<String, String> infos = new HashMap<String, String>();

	public CrashHandler() {

	}

	public static CrashHandler getInstance() {
		return crashHandler;
	}

	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		if (!handleException(ex) && mDefaultHandler != null) {
			mDefaultHandler.uncaughtException(thread, ex);
		} else {
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			android.os.Process.killProcess(android.os.Process.myPid());
			System.exit(1);
		}
	}

	private boolean handleException(Throwable ex) {
		if (null == ex) {
			return false;
		}
		new Thread() {
			@Override
			public void run() {
				Looper.prepare();
				Toast.makeText(context,
						context.getResources().getString(R.string.app_crash),
						Toast.LENGTH_SHORT).show();
				Looper.loop();
			}
		}.start();
		collectDeviceInfo(context);
		saveCrash2File(ex);
		Log.e(TAG, "", ex);
		return true;
	}

	public void init(Context context) {
		this.context = context;
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		Thread.setDefaultUncaughtExceptionHandler(this);
	}

	public void collectDeviceInfo(Context context) {
		try {
			PackageManager pm = context.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(context.getPackageName(),
					PackageManager.GET_ACTIVITIES);
			if (null != pi) {
				String versionName = pi.packageName == null ? "null"
						: pi.versionName;
				String versionCode = pi.versionCode + "";
				infos.put("versionName", versionName);
				infos.put("versionCode", versionCode);
			}
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields) {
			try {
				field.setAccessible(true);
				infos.put(field.getName(), field.get(null).toString());
			} catch (IllegalArgumentException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			}
		}
	}

	private String saveCrash2File(Throwable ex) {
		StringBuffer sb = new StringBuffer();
		for (Map.Entry<String, String> entry : infos.entrySet()) {
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}
		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null) {
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		String result = writer.toString();
		sb.append(result);
		try {
			long timetemp = System.currentTimeMillis();
			String time = dateFormat.format(timetemp);
			String fileName = "crash-" + time + "-" + timetemp + ".log";
			if (Environment.getExternalStorageState().equals(
					Environment.MEDIA_MOUNTED)) {
				String root = Environment.getExternalStorageDirectory()
						.getPath();
				String path = root + "/Android/data/com.lenovo.newsapp/";
				File dir = new File(path);
				if (!dir.exists()) {
					dir.mkdirs();
				}
				FileOutputStream fos = new FileOutputStream(path + fileName);
				fos.write(sb.toString().getBytes());
				fos.close();
			}
			return fileName;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}
